Monkey.D.Luffy (SP)

"[On Play] / [When Attacking] DON!! -2 (You may return the specified number of DON!! cards from your field to your DON!! deck.): If your Leader is multicolored and your opponent has 5 or more DON!! cards on their field, your "Straw Hat Crew" type Leader's base power becomes 7000 until the end of your opponent's next End Phase."